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https://www.readbyqxmd.com/read/29777411/spatial-environmental-risk-evaluation-of-potential-toxic-elements-in-stream-sediments
#1
I M H R Antunes, M T D Albuquerque, N Roque
Potential toxic elements (PTE), in stream sediments, were used as contamination indicators for the definition of high-/low-grade spatial clusters in the Monfortinho area (Central Portugal). A set of 271 stream sediment samples was used for spatial modelling and further definition of rings of enrichment-high and low rings. A three-step multivariate statistical and geostatistical approach was used: (1) principal components analysis for PTE's association evaluation and dimensionality reduction; (2) ordinary kriging as an unbiased interpolator for content inference and construction of a continuous representation of the considered attributes, at any arbitrary spatial location; (3) G clustering algorithm for the definition of high and low significance clusters...
May 18, 2018: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/29777094/biological-monitoring-and-lung-function-assessment-among-workers-exposed-to-chromium-in-the-ceramic-industry
#2
Fatemeh Kargar Shouroki, Seyed Jamaleddin Shahtaheri, Farideh Golbabaei, Abolfazle Barkhordari, Abbas Rahimi-Froushani
BACKGROUND: Chromium exposure occurs in various industries such as ceramics industry. The main disadvantage of chromium is high toxicity when absorbed by the body. This study aimed to determine and compare urinary chromium values in the pre- and post-shift of ceramic glazers and the control group; investigate urinary chromium value according to the study variables; compare pulmonary function tests between ceramic glazers vs. the control group. STUDY DESIGN: A cross-sectional study...
March 19, 2018: Journal of Research in Health Sciences
https://www.readbyqxmd.com/read/29752519/potential-toxic-metal-accumulation-in-soil-forage-and-blood-plasma-of-buffaloes-sampled-from-jhang-pakistan
#3
Zafar Iqbal Khan, Ilker Ugulu, Sara Umar, Kafeel Ahmad, Naunain Mehmood, Asma Ashfaq, Humayun Bashir, Muhammad Sohail
This study was conducted to determine the concentration of toxic metals in soil, forage and blood plasma of lactating and non-lactating buffaloes in the district Jhang, Punjab, Pakistan. Soil samples were collected from varying distances from the road side. Plasma separation was achieved by centrifugation. The concentration of arsenic (As), selenium (Se), cadmium (Cd), chromium (Cr), iron (Fe), zinc (Zn), copper (Cu) and cobalt (Co) were determined by using Atomic Absorption Spectrophotometer. The results of the study showed that the mean As, Se and Cd concentrations in soil samples were lower while Cr, Fe, Zn, Cu and Co were higher than the official guidelines...
May 12, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29748929/toxicological-aspect-of-some-selected-medicinal-plant-samples-collected-from-djelfa-algeria-region
#4
Samir Begaa, Mohammed Messaoudi
Instrumental neutron activation analysis (INAA) has been used to determine the concentration of some toxic chemical elements in a variety of aromatic plants samples collected from Djelfa region. In the present work, eight medicinal plants were examined, such as Artemisia herba-alba Asso., Artemisia compestris L., Laurus nobilis L., Origanum vulgare L., Mentha spicata L., Rosmarinus officinalis L., Mentha pulegium L., and Pistacia lentiscus L. The levels of toxic elements were compared to their daily total intake; Arsenic was present in all plant species examined, with a concentration ranging from 0...
May 10, 2018: Biological Trace Element Research
https://www.readbyqxmd.com/read/29748803/hexavalent-chromium-removal-from-aqueous-solution-using-functionalized-chitosan-as-a-novel-nano-adsorbent-modeling-and-optimization-kinetic-isotherm-and-thermodynamic-studies-and-toxicity-testing
#5
Hassan Aslani, Tayebeh Ebrahimi Kosari, Simin Naseri, Ramin Nabizadeh, Mohammad Khazaei
Hexavalent chromium is a highly toxic metal that can enter drinking water sources. Chitosan, which contains amino and hydroxyl functional groups, is considered an appropriate candidate to remove heavy metals through absorption. In this study, a novel adsorbent, magnetic nanoparticles of chitosan modified with polyhexamethylene biguanide (Ch-PHMB NPs) was synthesized and was used to successfully remove chromium from aqueous solution. Quadratic models with independent variables including pH, adsorbent dosage, time, and the initial concentration of chromium were proposed through RSM to describe the behavior of both magnetic chitosan (M-Ch) and Ch-PHMB NPs in Cr(VI) removal...
May 10, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29740013/impact-of-technological-innovation-and-regulation-development-on-e-waste-toxicity-a-case-study-of-waste-mobile-phones
#6
Yu Chen, Mengjun Chen, Yungui Li, Bin Wang, Shu Chen, Zhonghui Xu
Technology innovation has accelerated progress in Information and Communications Technology (ICT), especially in the mobile phones sector. Concurrently, local, national, and international governments are enforcing stricter regulations to protect natural resources and human health. The paper attempts to address the question: Have technological innovations and regulation development had a positive impact on ecosystems and public health? We identified 36 waste mobile phones (WMPs) manufactured between 2002 and 2013, assessed their metals concentration, leachability, and potential impact on environment and human health using digestion, Toxicity Characteristic Leaching Procedure (TCLP), and USEtox model, respectively...
May 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29723050/enhancement-of-toxic-cr-vi-fe-and-other-heavy-metals-phytoremediation-by-the-synergistic-combination-of-native-bacillus-cereus-strain-and-vetiveria-zizanioides-l
#7
A K Nayak, S S Panda, A Basu, N K Dhal
Bioremediation of Cr (VI), Fe, and other heavy metals (HMs) through plant-microbes interaction is one of the efficient strategies due to its high efficiency, low cost, and ecofriendly nature. The aim of the study was to isolate, characterize, and assess the potential of rhizospheric bacteria to enhance growth and metal accumulation by the chromium hyperaccumulator Vetiveria zizanoides. The bacterial strain isolated from mine tailings was identified to be Bacillus cereus (T1B3) strain exhibited plant growth-promoting traits including, 1-aminocyclopropane-1-carboxylate deaminase, indole acetic acid, and siderophores production, nitrogen fixation, and P solubilization...
June 7, 2018: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/29705899/interplay-between-elemental-imbalance-related-pi3k-akt-mtor-regulated-apoptosis-and-autophagy-in-arsenic-iii-induced-jejunum-toxicity-of-chicken
#8
Yu Wang, Hongjing Zhao, Yizhi Shao, Juanjuan Liu, Jinglun Li, Mingwei Xing
Arsenic trioxide (As2 O3 ), the most toxic form of arsenic found in foodstuffs, is considered a carcinogen for human and animal. But many of the events that occur during its passage through the gastrointestinal tract are uncharted in birds. This study assesses the toxic effect on the jejunum of chicken which subchronically exposed to diets that contain As2 O3 (0, 0.625, 1.25, 2.5 mg/kg body weight) for 90 days. Electron microscopy, TdT-mediated dUTP nick-end labeling (TUNEL), qPCR, and Western blot were performed...
April 28, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29704021/cytotoxic-assessment-of-chromium-and-arsenic-using-chromosomal-behavior-of-root-meristem-in-allium-cepa-l
#9
Kiran Gupta, Kumkum Mishra, Sudhakar Srivastava, Amit Kumar
A study was performed for phyto-genotoxic assay of chromium (Cr) and arsenic (As) through Allium cepa. Various concentrations (0, 1, 3, 6 and 12 mg L-1 ) of Cr and As for 48 and 168 h time points exposed to A. cepa. The phytotoxic effects of metal(loid) were evident through inhibited root length and root protein. Metal(loid) toxicity also lead to genotoxic effects, which included depression of mitotic index and increased frequency of chromosomes aberrations like break, fragments, c-metaphase, multipolar arrangements etc...
April 27, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29700420/exposure-to-toxic-metals-triggers-unique-responses-from-the-rat-gut-microbiota
#10
Joshua B Richardson, Blair C R Dancy, Cassandra L Horton, Young S Lee, Michael S Madejczyk, Zhenjiang Zech Xu, Gail Ackermann, Gregory Humphrey, Gustavo Palacios, Rob Knight, John A Lewis
Our understanding of the interaction between the gut microbiota and host health has recently improved dramatically. However, the effects of toxic metal exposure on the gut microbiota remain poorly characterized. As this microbiota creates a critical interface between the external environment and the host's cells, it may play an important role in host outcomes during exposure. We therefore used 16S ribosomal RNA (rRNA) gene sequencing to track changes in the gut microbiota composition of rats exposed to heavy metals...
April 26, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29689436/simultaneous-cr-vi-bio-reduction-and-methane-production-by-anaerobic-granular-sludge
#11
Qian Hu, Jiaji Sun, Dezhi Sun, Lan Tian, Yanan Ji, Bin Qiu
Wastewater containing toxic hexavalent chromium (Cr(VI)) were treated with well-organized anaerobic granular sludge in this study. Results showed that the anaerobic granular sludge rapidly removed Cr(VI), and 2000 µg·L-1 Cr(VI) was completely eliminated within 6 min, which was much faster than the reported duration of removal by reported artificial materials. Sucrose added as a carbon source acted as an initial electron donor to reduce Cr(VI) to Cr(III). This process was considered as the main mechanism of Cr(VI) removal...
April 16, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29679700/toxicity-of-porcelain-fused-to-metal-substrate-to-zebrafish-danio-rerio-embryos-and-larvae
#12
Libo Zhao, Jing Si, Yuan Wei, Sirui Li, Yanjiao Jiang, Rong Zhou, Bin Liu, Hong Zhang
AIMS: Porcelain-fused-to-metal (PFM) crowns are a standard restoration technique in dentistry, but toxicity of PFM in vivo has not been systematically evaluated. The present study evaluated the effects of various metal alloy shells of PFM crowns on the development of zebrafish embryos and larvae in order to determine the safety of these materials. MAIN METHODS: Gold palladium (Au-Pd), silver palladium (Ag-Pd), Nickel chromium (Ni-Cr), cobalt chromium (Co-Cr), titanium (Ti) alloy porcelain crowns were immersed in artificial saliva for 1, 4, and 7 weeks, and the leach solution was collected and used to treat zebrafish embryos at 4-144 h PFM...
April 18, 2018: Life Sciences
https://www.readbyqxmd.com/read/29679608/detection-and-quantitative-determination-of-heavy-metals-in-electronic-cigarette-refill-liquids-using-total-reflection-x-ray-fluorescence-spectrometry
#13
Eleni Kamilari, Konstantinos Farsalinos, Konstantinos Poulas, Christos G Kontoyannis, Malvina G Orkoula
Electronic cigarettes are considered healthier alternatives to conventional cigarettes containing tobacco. They produce vapor through heating of the refill liquids (e-liquids) which consist of propylene glycol, vegetable glycerin, nicotine (in various concentrations), water and flavoring agents. Heavy metals may enter the refill liquid during the production, posing a risk for consumer's health due to their toxicity. The objective of the present study was the development of a methodology for the detection and quantitative analysis of cadmium (Cd), lead (Pb), nickel (Ni), copper (Cu), arsenic (As) and chromium (Cr), employing Total Reflection X-Ray Fluorescence Spectroscopy (TXRF) as an alternative technique to ICP-MS or ICP-OES commonly used for this type of analysis...
April 18, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29676757/arsenic-cadmium-lead-and-chromium-in-well-water-rice-and-human-urine-in-sri-lanka-in-relation-to-chronic-kidney-disease-of-unknown-etiology
#14
H M Ayala S Herath, Tomonori Kawakami, Shiori Nagasawa, Yuka Serikawa, Ayuri Motoyama, G G Tushara Chaminda, S K Weragoda, S K Yatigammana, A A G D Amarasooriya
Chronic kidney disease of unknown etiology (CKDu) is spreading gradually in Sri Lanka. In the current research, 1,435 well water samples from all 25 districts of Sri Lanka, 91 rice samples, and 84 human urine samples from both CKDu-endemic and non-endemic areas in Sri Lanka were analyzed for arsenic, cadmium, lead, and chromium to detect whether toxic elements could be a cause of CKDu. The liver-type fatty acid binding protein (L-FABP) concentration and arsenic, cadmium, lead, and chromium concentrations of the urine samples were analyzed to determine the relation of L-FABP with arsenic, cadmium, lead, and chromium...
April 2018: Journal of Water and Health
https://www.readbyqxmd.com/read/29676648/global-tobacco-use-old-and-new-products
#15
Ana Navas-Acien
Tobacco use and exposure to tobacco smoke remain major but avoidable causes of premature mortality and disease worldwide. Although the age-standardized prevalence of daily smoking has declined for both men and women in many countries, the number of smokers continues to increase because of global population growth. Although cigarettes are the most commonly used tobacco product, the tobacco epidemic has become tremendously complex with the emergence and popularity of alternative products such as waterpipes and electronic cigarettes (also known as e-cigarettes)...
April 2018: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/29674487/metals-in-urine-in-relation-to-the-prevalence-of-pre-diabetes-diabetes-and-atherosclerosis-in-rural-india
#16
Ganesan Velmurugan, Krishnan Swaminathan, Ganesh Veerasekar, Jonathan Q Purnell, Sundaresan Mohanraj, Mani Dhivakar, Anil Kumar Avula, Mathew Cherian, Nalla G Palaniswami, Thomas Alexander, Thalappil Pradeep
OBJECTIVE: Diabetes and cardiovascular diseases are growing burdens in rural communities worldwide. We have observed a high prevalence of diabetes among rural farming communities in India and sought to evaluate the association of non-traditional risk factors, such as metals, with diabetes and other cardiometabolic risk factors in this community. METHODS: Anthropometric measurements, chemistries and carotid intima-media thickness were determined in 865 participants of the Kovai Medical Center and Hospital-Nallampatti Non-Communicable Disease Study-I (KMCH-NNCD-I, 2015), a cross-sectional study conducted in a farming village in South India...
April 19, 2018: Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/29666936/assessment-of-toxic-impact-of-metals-on-proline-antioxidant-enzymes-and-biological-characteristics-of-pseudomonas-aeruginosa-inoculated-cicer-arietinum-grown-in-chromium-and-nickel-stressed-sandy-clay-loam-soils
#17
Saima Saif, Mohammad Saghir Khan
Considering the heavy metal risk to soil microbiota and agro-ecosystems, the study was designed to determine metal toxicity to bacteria and to find metal tolerant bacteria carrying multifarious plant growth promoting activities and to assess their impact on chickpea cultivated in stressed soils. Metal tolerant strain SFP1 recognized as Pseudomonas aeruginosa employing 16S rRNA gene sequence determination showed maximum tolerance to Cr (400 μg/ml) and Ni (800 μg/ml) and produced variable amounts of indole acetic acid, HCN, NH3 , and ACC deaminase and could solubilize insoluble phosphates even under Cr (VI) and Ni stress...
April 17, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29665650/selenium-nanoparticles-prevents-lead-acetate-induced-hypothyroidism-and-oxidative-damage-of-thyroid-tissues-in-male-rats-through-modulation-of-selenoenzymes-and-suppression-of-mir-224
#18
Hebatallah Husseini Atteia, Manar Hamed Arafa, Kousalya Prabahar
Selenium nanoparticles (Se-NPs) are customizable drug delivery vehicles that show good bioavailability, higher efficacy and lower toxicity than ordinary Se. Pre-treatment of male rats with these NPs has been recently shown to exert a protective effect against chromium-induced thyroid dysfunction. This study, therefore, aimed to investigate and characterize the potential protective mechanism of Se-NPs against lead (Pb) acetate-induced thyrotoxicity. We found that prophylactic and concurrent treatment of Pb acetate-exposed rats with Nano-Se (0...
March 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29665407/3-4-dihydroxybenzaldehyde-quenches-ros-and-rns-and-protects-human-blood-cells-from-cr-vi-induced-cytotoxicity-and-genotoxicity
#19
Nazim Husain, Riaz Mahmood
Hexavalent chromium [Cr(VI)] is the most toxic and potent form of chromium and induces multiple organ damage in humans and experimental animals. Oxidative stress has been implicated in the toxicity of Cr(VI). We have examined the potential role of 3,4-dihydroxybenzaldehyde (DHB), a plant polyphenolic antioxidant, in protecting human erythrocytes and lymphocytes from Cr(VI)-induced cytotoxicity and genotoxicity. Erythrocytes were treated with potassium dichromate, a Cr(VI) compound, in presence and absence of DHB...
April 14, 2018: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/29662899/chromium-vi-toxicity-in-legume-plants-modulation-effects-of-rhizobial-symbiosis
#20
REVIEW
Uliana Ya Stambulska, Maria M Bayliak, Volodymyr I Lushchak
Most legume species have the ability to establish a symbiotic relationship with soil nitrogen-fixing rhizobacteria that promote plant growth and productivity. There is an increasing evidence of reactive oxygen species (ROS) important role in formation of legume-rhizobium symbiosis and nodule functioning. Environmental pollutants such as chromium compounds can cause damage to rhizobia, legumes, and their symbiosis. In plants, toxic effects of chromium(VI) compounds are associated with the increased production of ROS and oxidative stress development as well as with inhibition of pigment synthesis and modification of virtually all cellular components...
2018: BioMed Research International
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